Cosmological constraints on non-standard inflationary quantum collapse models

Abstract

We briefly review an important shortcoming --unearthed in previous works-- of the standard version of the inflationary model for the emergence of the seeds of cosmic structure. We consider here some consequences emerging from a proposal inspired on ideas of Penrose and Diósi about a quantum-gravity induced reduction of the wave function, which has been put forward to address the shortcomings, arguing that its effect on the inflaton field is what can lead to the emergence of the seeds of cosmic structure. The proposal leads to a deviation of the primordial spectrum from the scale-invariant Harrison-Zel'dovich one, and consequently, to a different CMB power spectrum. We perform statistical analyses to test two quantum collapse schemes with recent data from the CMB, including the 7-yr release of WMAP and the matter power spectrum measured using LRGs by the Sloan Digital Sky Survey. Results from the statistical analyses indicate that several collapse models are compatible with CMB and LRG data, and establish constraints on the free parameters of the models. The data put no restriction on the timescale for the collapse of the scalar field modes.

23 pages, 16 figures, replaced to match version to appear in Physical Review D

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• A Non-static Quantum inspired Spacetime in $f(R)$ Gravity: Gravity's Rainbow
• Constraining quantum collapse inflationary models with CMB data
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• Constraining quantum collapse inflationary models with current data: The semiclassical approach
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• Inhomogeneities from quantum collapse scheme without inflation
• Newtonian Semiclassical Gravity in the Ghirardi-Rimini-Weber Theory with Matter Density Ontology
• A (not so?) novel explanation for the very special initial state of the universe
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